Method constructor

lib/Compilation.js:603–1402

* Creates an instance of Compilation. * @param {Compiler} compiler the compiler which created the compilation * @param {CompilationParams} params the compilation parameters

(compiler, params)

	 * @param {CompilationParams} params the compilation parameters
	 */
	constructor(compiler, params) {
		/** @type {boolean} */
		this._backCompat = compiler._backCompat;

		const getNormalModuleLoader = () => deprecatedNormalModuleLoaderHook(this);
		/** @typedef {{ additionalAssets?: boolean | ((assets: CompilationAssets) => void) }} ProcessAssetsAdditionalOptions */
		/** @type {AsyncSeriesHook<[CompilationAssets], ProcessAssetsAdditionalOptions>} */
		const processAssetsHook = new AsyncSeriesHook([class="st">"assets"]);

		/** @type {Set<string>} */
		let savedAssets = new Set();
		/**
		 * Returns new assets.
		 * @param {CompilationAssets} assets assets
		 * @returns {CompilationAssets} new assets
		 */
		const popNewAssets = (assets) => {
			/** @type {undefined | CompilationAssets} */
			let newAssets;
			for (const file of Object.keys(assets)) {
				if (savedAssets.has(file)) continue;
				if (newAssets === undefined) {
					newAssets = Object.create(null);
				}
				/** @type {CompilationAssets} */
				(newAssets)[file] = assets[file];
				savedAssets.add(file);
			}
			return /** @type {CompilationAssets} */ (newAssets);
		};
		processAssetsHook.intercept({
			name: class="st">"Compilation",
			call: () => {
				savedAssets = new Set(Object.keys(this.assets));
			},
			register: (tap) => {
				const { type, name } = tap;
				const { fn, additionalAssets, ...remainingTap } = tap;
				const additionalAssetsFn =
					additionalAssets === true ? fn : additionalAssets;
				/** @typedef {WeakSet<CompilationAssets>} ProcessedAssets */

				/** @type {ProcessedAssets | undefined} */
				const processedAssets = additionalAssetsFn ? new WeakSet() : undefined;
				/**
				 * Gets available assets.
				 * @param {CompilationAssets} assets to be processed by additionalAssetsFn
				 * @returns {CompilationAssets} available assets
				 */
				const getAvailableAssets = (assets) => {
					/** @type {CompilationAssets} */
					const availableAssets = {};
					for (const file of Object.keys(assets)) {
						class="cm">// https://github.com/webpack-contrib/compression-webpack-plugin/issues/390
						if (this.assets[file]) {
							availableAssets[file] = assets[file];
						}
					}